|
11523
|
1 ## Copyright (C) 1995-2011 Friedrich Leisch |
|
3426
|
2 ## |
|
3922
|
3 ## This file is part of Octave. |
|
|
4 ## |
|
|
5 ## Octave is free software; you can redistribute it and/or modify it |
|
|
6 ## under the terms of the GNU General Public License as published by |
|
7016
|
7 ## the Free Software Foundation; either version 3 of the License, or (at |
|
|
8 ## your option) any later version. |
|
3426
|
9 ## |
|
3922
|
10 ## Octave is distributed in the hope that it will be useful, but |
|
3191
|
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
|
|
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
3426
|
13 ## General Public License for more details. |
|
|
14 ## |
|
3191
|
15 ## You should have received a copy of the GNU General Public License |
|
7016
|
16 ## along with Octave; see the file COPYING. If not, see |
|
|
17 ## <http://www.gnu.org/licenses/>. |
|
3191
|
18 |
|
3449
|
19 ## -*- texinfo -*- |
|
|
20 ## @deftypefn {Function File} {} rectangle_sw (@var{n}, @var{b}) |
|
|
21 ## Rectangular spectral window. Subfunction used for spectral density |
|
3191
|
22 ## estimation. |
|
3449
|
23 ## @end deftypefn |
|
3426
|
24 |
|
3457
|
25 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at> |
|
|
26 ## Description: Rectangular spectral window |
|
3191
|
27 |
|
|
28 function retval = rectangle_sw (n, b) |
|
3426
|
29 |
|
7125
|
30 if (nargin != 2) |
|
|
31 print_usage (); |
|
|
32 endif |
|
|
33 |
|
3191
|
34 retval = zeros (n, 1); |
|
|
35 retval(1) = 2 / b + 1; |
|
|
36 |
|
|
37 l = (2:n)' - 1; |
|
|
38 l = 2 * pi * l / n; |
|
|
39 |
|
3457
|
40 retval(2:n) = sin ((2/b + 1) * l / 2) ./ sin (l / 2); |
|
3426
|
41 |
|
3191
|
42 endfunction |
|
|
43 |
|
|
44 |
|
|
45 |
|
|
46 |
|
|
47 |
|
|
48 |
|
|
49 |
|
|
50 |
|
|
51 |
|
|
52 |
|
|
53 |
|
|
54 |
|
|
55 |
|
|
56 |
|
|
57 |
|
|
58 |
|
|
59 |
|
|
60 |
|
|
61 |
|
|
62 |
|
|
63 |
|
|
64 |
|
|
65 |
|
|
66 |
|
|
67 |
|
|
68 |
|
|
69 |
|
|
70 |
|
|
71 |
|
|
72 |
